[PATCH] D77624: [PowerPC] Update alignment for RLI in LowerFP_TO_INTForReuse

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
lkail added reviewers: PowerPC, jsji, nemanjai, steven.zhang.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.
Herald added a project: LLVM.

In LowerFP_TO_INTForReuse, when emitting `stfiwx`, alignment of 4 is
set for the `MachineMemOperand`, but RLI's alignment is not updated
for following loads.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D77624

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/kernel-fp-round.ll


Index: llvm/test/CodeGen/PowerPC/kernel-fp-round.ll
===================================================================
--- llvm/test/CodeGen/PowerPC/kernel-fp-round.ll
+++ llvm/test/CodeGen/PowerPC/kernel-fp-round.ll
@@ -6,7 +6,7 @@
 ; CHECK-NEXT:   - { id: 0, size: 4, alignment: 4 }
 ; CHECK:        %2:f8rc = FCTIWZ killed %1, implicit $rm
 ; CHECK:        STFIWX killed %2, $zero8, %3
-; CHECK-NEXT:   %4:f8rc = LFIWAX $zero8, %3 :: (load 4 from %stack.0, align 1)
+; CHECK-NEXT:   %4:f8rc = LFIWAX $zero8, %3 :: (load 4 from %stack.0)
 entry:
   %b = fptosi float %a to i32
   %c = sitofp i32 %b to float
Index: llvm/lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -7919,10 +7919,12 @@
 
   // Emit a store to the stack slot.
   SDValue Chain;
+  Align Alignment;
   if (i32Stack) {
     MachineFunction &MF = DAG.getMachineFunction();
     MachineMemOperand *MMO =
         MF.getMachineMemOperand(MPI, MachineMemOperand::MOStore, 4, Align(4));
+    Alignment = Align(4);
     SDValue Ops[] = { DAG.getEntryNode(), Tmp, FIPtr };
     Chain = DAG.getMemIntrinsicNode(PPCISD::STFIWX, dl,
               DAG.getVTList(MVT::Other), Ops, MVT::i32, MMO);
@@ -7940,6 +7942,7 @@
   RLI.Chain = Chain;
   RLI.Ptr = FIPtr;
   RLI.MPI = MPI;
+  RLI.Alignment = Alignment;
 }
 
 /// Custom lowers floating point to integer conversions to use


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